CN206313006U - Battery diaphragm and battery - Google Patents
Battery diaphragm and battery Download PDFInfo
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- CN206313006U CN206313006U CN201621424883.XU CN201621424883U CN206313006U CN 206313006 U CN206313006 U CN 206313006U CN 201621424883 U CN201621424883 U CN 201621424883U CN 206313006 U CN206313006 U CN 206313006U
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- battery
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- thermoplastic resin
- resin layer
- battery diaphragm
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
A kind of battery diaphragm, including thermoplastic resin layer and polypropylene nitrile layer.Thermoplastic resin layer is attached and is arranged at polypropylene nitrile layer, and thermoplastic resin layer is polyethylene layer or polypropylene layer, and the thickness of thermoplastic resin layer is 3 μm~35 μm, and the thickness of polypropylene nitrile layer is 1 μm~10 μm.Above-mentioned battery diaphragm, when by foreign matter puncture or heavy impact or extruding, barrier film is hardly damaged, and can still keep preferable porosity, so as to reduce the risk of positive electrode and negative material directly contact, so as to improve the security of lithium ion battery.It it is 3 μm~35 μm by by the thickness of thermoplastic resin layer, the thickness of polypropylene nitrile layer is 1 μm~10 μm, in such manner, it is possible to so that internal resistance when battery diaphragm is applied to lithium ion resistance is more suitable, moreover it is possible to improve the security of lithium ion battery.
Description
Technical field
The utility model is related to cell art, more particularly to a kind of battery diaphragm and battery.
Background technology
Lithium ion battery is widely used in mobile phone, panel computer, notebook computer, wearable device, portable power source, intelligence
Household, navigator, Baffle Box of Bluetooth, smart card, unmanned plane, electronic cigarette, VR, balance car, wheelbarrow, robot, electric tool, electricity
The fields such as dynamic bicycle, electric automobile, energy-accumulating power station.With the development of science and technology, requirement of the people to lithium ion battery
More and more higher is more long if desired for possessing energy density higher, the cycle life of long period, quickly-chargeable, cruising time
Deng.Client to the performance requirement more and more higher of lithium ion battery, improve battery performance as a kind of urgent and universal requirement.
Common lithium battery includes positive electrode, negative material, electrolyte, barrier film and battery case packaging material.And
In the structure of lithium battery, used as one of crucial interior layer assembly, the performance of barrier film determines the interfacial structure of battery, interior to barrier film
Resistance etc., directly affects capacity, circulation and the characteristic such as security performance of battery, and the barrier film of excellent performance is to improving the synthesis of battery
Performance has important effect.
The polymer Li-ion battery commonly used at present, when energy density more and more higher, battery capacity are increasing,
Security performance turns into more distinct issues.
The barrier film that existing lithium battery is used, refers to Fig. 1, and barrier film 20 is generally only one layer of thermoplastic resin layer 21, institute
Thermoplastic resin layer is stated for polyethylene layer or polypropylene layer.Existing barrier film is still present that tensile strength is poor and fire resistance
Also poor problem, when by foreign matter puncture or heavy impact or extruding, is easily destroyed and even damages battery diaphragm, makes
Obtain positive and negative pole material mixing and cause local pyrexia uneven or the too high problem of temperature, or even have the danger that battery explosion occurs,
So that the security of battery is relatively low.
Utility model content
Based on this, it is necessary to provide a kind of security preferably, fire resistance it is higher and by foreign matter puncture or weigh
Thing impact or extrude when barrier film be hardly damaged, can still keep preferable porosity battery diaphragm and including the battery every
The battery of film.
A kind of battery diaphragm, including thermoplastic resin layer and polypropylene nitrile layer, the thermoplastic resin layer are attached and are arranged at
The polypropylene nitrile layer, the thermoplastic resin layer is polyethylene layer or polypropylene layer, and the thickness of the thermoplastic resin layer is 3
μm~35 μm, the thickness of the polypropylene nitrile layer is 1 μm~10 μm.
Wherein in one embodiment, the polypropylene nitrile layer, the ratio of the thickness of the thermoplastic resin layer are 1：
(2.4~3.7).
Wherein in one embodiment, the polypropylene nitrile layer, the ratio of the thickness of the thermoplastic resin layer are 1：
(2.7~3.15).
Wherein in one embodiment, the polypropylene nitrile layer, the ratio of the thickness of the thermoplastic resin layer are 1：3.
Wherein in one embodiment, the thickness of the thermoplastic resin layer is 9 μm.
Wherein in one embodiment, the thickness of the polypropylene nitrile layer is 3 μm.
Wherein in one embodiment, also including gathering inclined fluorine diethyl ene coatings, the poly- inclined fluorine diethyl ene coatings are arranged at
The polypropylene nitrile layer is away from the side of the thermoplastic resin layer.
Wherein in one embodiment, the porosity of the battery diaphragm is 40%-45%.
A kind of battery, it includes positive pole, negative pole, electrolyte and barrier film, the barrier film be as above any described battery every
Film.
Wherein in one embodiment, the battery is soft bag lithium ionic cell.
Above-mentioned battery diaphragm, by setting polypropylene nitrile layer, the polypropylene nitrile layer in traditional thermoplastic resin layer
With preferable elasticity, intensity is relatively stable, can acidproof, antioxidant and some organic solvents so that the polyacrylonitrile
When layer is used together with the thermoplastic resin layer, enable to the tensile strength of battery diaphragm good, keep the hole of battery diaphragm
Gap rate, can make the porosity change of battery diaphragm smaller, when by foreign matter puncture or heavy impact or extruding, barrier film
It is hardly damaged, can still keeps preferable porosity, so as to reduce the risk of positive electrode and negative material directly contact,
So as to improve the security of lithium ion battery.Additionally, by setting polypropylene nitrile layer in traditional thermoplastic resin layer, moreover it is possible to
Improve battery diaphragm heat resistance, further increase the fire retardancy of battery diaphragm so that the security of lithium ion battery compared with
It is good.It is 3 μm~35 μm by by the thickness of the thermoplastic resin layer, the thickness of the polypropylene nitrile layer is 1 μm~10 μm, this
Sample, internal resistance when enabling to battery diaphragm to be applied to lithium ion resistance is more suitable, moreover it is possible to improve the safety of lithium ion battery
Property.
Brief description of the drawings
Fig. 1 is the structural representation of conventional batteries barrier film；
Fig. 2 is the structural representation of the battery diaphragm of the implementation method of the utility model one.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, is not used to limit the utility model.
For example, a kind of battery diaphragm, including thermoplastic resin layer and polypropylene nitrile layer, the thermoplastic resin layer is attached and set
The polypropylene nitrile layer is placed in, the thermoplastic resin layer is polyethylene layer or polypropylene layer, the thickness of the thermoplastic resin layer
It is 3 μm~35 μm to spend, and the thickness of the polypropylene nitrile layer is 1 μm~10 μm.
In order to further illustrate above-mentioned battery diaphragm, another example is to refer to Fig. 2, and battery diaphragm 10 includes thermoplastic
Property resin bed 100 and polypropylene nitrile layer 200, the thermoplastic resin layer attaches and is arranged at the polypropylene nitrile layer, the thermoplastic
Property resin bed be polyethylene flaggy or polypropylene flaggy, the thickness of the thermoplastic resin layer is 3 μm~35 μm, the polypropylene
The thickness of nitrile layer is 1 μm~10 μm.The thermoplastic resin layer has polyethylene flaggy or polypropylene flaggy, also it is understood that
The thermoplastic resin layer is polyethylene layer or polypropylene layer.By in traditional thermoplastic resin layer, polyacrylonitrile is set
Layer, the polypropylene nitrile layer has preferably elasticity, and intensity is relatively stable, can acidproof, antioxidant and some organic solvents,
During so that the polypropylene nitrile layer being used together with the thermoplastic resin layer, enable to the tensile strength of battery diaphragm good,
The porosity of battery diaphragm is kept, the porosity change of battery diaphragm can be made smaller, punctured or weight punching by foreign matter
When hitting or extruding, barrier film is hardly damaged, and can still keep preferable porosity, so as to reduce positive electrode and negative pole material
The risk of directly contact is expected, so as to improve the security of lithium ion battery.Additionally, being set by traditional thermoplastic resin layer
Put polypropylene nitrile layer, moreover it is possible to improve the heat resistance of battery diaphragm, further increase the fire retardancy of battery diaphragm so that lithium from
The security of sub- battery is preferable.It is 3 μm~35 μm, the thickness of the polypropylene nitrile layer by by the thickness of the thermoplastic resin layer
It is 1 μm~10 μm to spend, in such manner, it is possible to so that internal resistance when battery diaphragm is applied to lithium ion resistance is more suitable, moreover it is possible to improve
The security of lithium ion battery.
It should be noted that in battery diaphragm, when the battery diaphragm is applied into lithium ion battery, the thermoplasticity
Resin bed influences whether interfacial structure and internal resistance of lithium ion battery etc. with the thickness of the polypropylene nitrile layer.Larger internal resistance,
Influence whether the charge and discharge process of lithium ion battery so that the discharge and recharge time is more long, and internal resistance is smaller, easily cause lithium-ion electric
Pond inner heat is too fast, and potential safety hazard is higher so that security is poor.In one embodiment, the polypropylene nitrile layer, the thermoplastic
Property resin bed thickness ratio be 1：(2.4~3.7), in such manner, it is possible to so that when battery diaphragm is applied to lithium ion resistance
Internal resistance is more suitable, moreover it is possible to improve the security of lithium ion battery.And for example, the polypropylene nitrile layer, the thermoplastic resin layer
Thickness ratio be 1：(2.7~3.15), and for example, the polypropylene nitrile layer, the ratio of the thickness of the thermoplastic resin layer
It is 1：3, in such manner, it is possible to further such that internal resistance when battery diaphragm is applied to lithium ion resistance is more suitable, moreover it is possible to improve lithium
The security of ion battery.And for example, the thickness of the thermoplastic resin layer is 3 μm~35 μm, and for example, the polypropylene nitrile layer
Thickness is 1 μm~10 μm, and and for example, the thickness of the thermoplastic resin layer is 9 μm, and the thickness of the polypropylene nitrile layer is 3 μm, this
Sample, can be further such that internal resistance when battery diaphragm is applied to lithium ion resistance be more suitable, moreover it is possible to improve lithium ion battery
Security.
In order to further improve the intensity and puncture resistant ability of battery diaphragm, for example, the battery diaphragm also includes gathering inclined
Fluorine diethyl ene coatings, the poly- inclined fluorine diethyl ene coatings are arranged at side of the polypropylene nitrile layer away from the thermoplastic resin layer
On face, so, by setting the poly- inclined fluorine diethyl ene coatings, the mechanical strength and anti-tensile of battery diaphragm can be further improved
Intensity, the especially poly- inclined fluorine diethyl ene coatings are arranged on side of the polypropylene nitrile layer away from the thermoplastic resin layer
When upper, moreover it is possible to improve the heat resistance and chemical stability of the battery diaphragm, can be further such that the stretching of battery diaphragm be strong
Spend, keep the porosity of battery diaphragm, the porosity change of battery diaphragm can be made smaller, punctured or weighing by foreign matter
When thing impacts or extrudes, barrier film is hardly damaged, and can still keep preferable porosity, so as to reduce positive electrode and bear
The risk of pole material directly contact, so as to improve the security of lithium ion battery.Especially, additionally it is possible to further improve battery every
The fire retardancy of film so that the security of lithium ion battery is preferable.And for example, it is described to gather inclined fluorine diethyl ene coatings and the polypropylene
The ratio of the thickness of nitrile layer is (0.7~1.15)：1.
In one embodiment, the porosity of the battery diaphragm is 40%-45%, in such manner, it is possible to make the lithium ion battery
Diaphragm application is when lithium ion battery, and gas permeability is preferable, moreover it is possible to improve the capacity of lithium ion battery.And for example, the battery diaphragm
Aperture be 0.01 micron~0.1 micron, so, the puncture ability of lithium ion is suitable, and can reduce in lithium ion battery
Portion generates dendrite and the problem of short circuit occurs, further increases the security of ion battery.And for example, the hole of the battery diaphragm
Footpath is 0.05 micron, can further reduce and generate dendrite and the problem of short circuit occur in inside lithium ion cell, is further carried
The security of ion battery high.
Above-mentioned battery diaphragm, by setting polypropylene nitrile layer, the polypropylene nitrile layer in traditional thermoplastic resin layer
With preferable elasticity, intensity is relatively stable, can acidproof, antioxidant and some organic solvents so that the polyacrylonitrile
When layer is used together with the thermoplastic resin layer, enable to the tensile strength of battery diaphragm good, keep the hole of battery diaphragm
Gap rate, can make the porosity change of battery diaphragm smaller, when by foreign matter puncture or heavy impact or extruding, barrier film
It is hardly damaged, can still keeps preferable porosity, so as to reduce the risk of positive electrode and negative material directly contact,
So as to improve the security of lithium ion battery.Additionally, by setting polypropylene nitrile layer in traditional thermoplastic resin layer, moreover it is possible to
Improve battery diaphragm heat resistance, further increase the fire retardancy of battery diaphragm so that the security of lithium ion battery compared with
It is good.
The present invention also provides a kind of battery including positive pole, negative pole, electrolyte and barrier film, and the barrier film is upper any one institute
The battery diaphragm stated.And for example, the battery is lithium ion battery, and and for example, the battery is soft bag lithium ionic cell.
It should be noted that how the positive pole, the negative pole, the electrolyte and the barrier film exist in battery,
And structural relation, composition etc. refer to prior art accordingly, the present invention will not be repeated here.
The battery diaphragm that above-mentioned battery is used, it is described by setting polypropylene nitrile layer in traditional thermoplastic resin layer
Polypropylene nitrile layer has preferably elasticity, and intensity is relatively stable, can acidproof, antioxidant and some organic solvents so that institute
When stating polypropylene nitrile layer and being used together with the thermoplastic resin layer, enable to the tensile strength of battery diaphragm good, keep electricity
The porosity of pond barrier film, can make the porosity change of battery diaphragm smaller, by foreign matter puncture or heavy impact or
During extruding, barrier film is hardly damaged, and can still keep preferable porosity, so as to reduce positive electrode and negative pole material in battery
The risk of directly contact is expected, so as to improve the security of lithium ion battery.Additionally, being set by traditional thermoplastic resin layer
Put polypropylene nitrile layer, moreover it is possible to improve the heat resistance of battery diaphragm, further increase the fire retardancy of battery diaphragm so that lithium from
The security of sub- battery is preferable.
In order to further illustrate battery diaphragm of the present utility model and battery, introduced with reference to specific embodiment.
Embodiment 1
The side of 9 μm of thermoplastic resin layers (mean molecule quantity 400,000) is combined/fitted 3 μm of polypropylene nitrile layer, is formed
Battery diaphragm.
Comparative example 1
The conventional membrane that thickness is 12 μm is chosen, conventional membrane is the plastic resin layers (mean molecule that individual layer sets 12 μm
Measure 40 ten thousand).
Same lithium ion battery is being respectively applied to the battery diaphragm of embodiment 1 and the battery diaphragm of comparative example 1 just
Pole material, negative material, electrolyte and packaging material, the battery before then respectively obtaining the battery after improving and improving, respectively
Battery for the battery after improvement and before improving carries out capacity, voltage, discharge test, high temperature storage test, loop test, short
Road, overcharge, hot tank, acupuncture, the test such as energy density and circulation ability.Test result is shown in Table 1.
Table 1
As it can be seen from table 1 relative to comparative example 1, battery diaphragm provided by the utility model can not change electricity
The cycle performance of battery is improved on the basis of the membrane thicknesses of pond, by short electrical testing and can be effectively improved different including metal etc.
Thing punctures the security performance of battery when battery, battery receive the destructive testings such as heavy impact, internal short-circuit.
The polymer Li-ion battery commonly used at present, when energy density more and more higher, battery capacity are increasing,
Security performance turns into more distinct issues.The utility model is by using PAN (polyacrylonitrile) layers and polyethylene layer or poly- third
Alkene layer is made high-safety polymer lithium ion battery separator, can effectively improve the foreign matter such as including metal and puncture battery, battery
The security performance of battery when receiving the destructive testings such as heavy impact, internal short-circuit.
The design that the utility model passes through battery diaphragm, on the basis of the electrochemical system for not changing battery, improves battery
Barrier film reaches the purpose for improving battery safety, and fast, input of producing effects is small, effect is obvious, and conversion difficulty is small, risk is small.So that
Battery safety is lifted, market competitiveness enhancing, is further able to improve customer loyalty.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of battery diaphragm, it is characterised in that including thermoplastic resin layer and polypropylene nitrile layer, the thermoplastic resin layer patch
Set up and be placed in the polypropylene nitrile layer, the thermoplastic resin layer is polyethylene layer or polypropylene layer, the thermoplastic resin layer
Thickness be 3 μm~35 μm, the thickness of the polypropylene nitrile layer is 1 μm~10 μm.
2. battery diaphragm according to claim 1, it is characterised in that the polypropylene nitrile layer, the thermoplastic resin layer
Thickness ratio be 1：(2.4~3.7).
3. battery diaphragm according to claim 1, it is characterised in that the polypropylene nitrile layer, the thermoplastic resin layer
Thickness ratio be 1：(2.7~3.15).
4. battery diaphragm according to claim 1, it is characterised in that the polypropylene nitrile layer, the thermoplastic resin layer
Thickness ratio be 1：3.
5. battery diaphragm according to claim 1, it is characterised in that the thickness of the thermoplastic resin layer is 9 μm.
6. battery diaphragm according to claim 1, it is characterised in that the thickness of the polypropylene nitrile layer is 3 μm.
7. battery diaphragm according to claim 1, it is characterised in that described poly- inclined also including gathering inclined fluorine diethyl ene coatings
Fluorine diethyl ene coatings are arranged at the polypropylene nitrile layer away from the side of the thermoplastic resin layer.
8. battery diaphragm according to claim 1, it is characterised in that the porosity of the battery diaphragm is 40%-45%.
9. a kind of battery, it includes positive pole, negative pole, electrolyte and barrier film, it is characterised in that the barrier film is such as claim 1
Battery diaphragm any one of~8.
10. battery as claimed in claim 9, it is characterised in that the battery is soft bag lithium ionic cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621424883.XU CN206313006U (en) | 2016-12-22 | 2016-12-22 | Battery diaphragm and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621424883.XU CN206313006U (en) | 2016-12-22 | 2016-12-22 | Battery diaphragm and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206313006U true CN206313006U (en) | 2017-07-07 |
Family
ID=59245766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621424883.XU Expired - Fee Related CN206313006U (en) | 2016-12-22 | 2016-12-22 | Battery diaphragm and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206313006U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116315459A (en) * | 2023-05-23 | 2023-06-23 | 宁德新能源科技有限公司 | Separator, electrochemical device, and electronic apparatus |
-
2016
- 2016-12-22 CN CN201621424883.XU patent/CN206313006U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116315459A (en) * | 2023-05-23 | 2023-06-23 | 宁德新能源科技有限公司 | Separator, electrochemical device, and electronic apparatus |
| CN116315459B (en) * | 2023-05-23 | 2023-09-05 | 宁德新能源科技有限公司 | Separator, electrochemical device, and electronic apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170707 Termination date: 20191222 |